Who can join
Studies for younger adults
These studies accept adults from 21 or younger and set an upper age limit of 45 or below, so they are aimed at younger adults. Being in the age range does not mean you qualify; screening decides.
674 recruiting studiesSource: ClinicalTrials.gov, refreshed October 26, 2026How we list studies
Studies
- RecruitingHealthy volunteers
The Effect of Respiratory Muscle Training on Cognitive Performance
Indiana University
- Location
- Bloomington, IN
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Effects of Stereotype Threat on Impulsivity and Its Relation to Alcohol Use in African Americans: An fMRI Study
Icahn School of Medicine at Mount Sinai
- Location
- New York, NY
- Eligibility basics
- Ages 21–35
- RecruitingHealthy volunteers
Characterization of Fetal Lung With Quantitative Ultrasound
University of Wisconsin, Madison
- Location
- Madison, WI
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Ketone Conferred Resiliency Against Sleep Restriction With Nutritional Intervention.
Ohio State University
- Location
- Columbus, OH
- Eligibility basics
- Ages 18–40
- RecruitingHealthy volunteers
Breastmilk in Response to a Bout of Exercise
Mayo Clinic
- Location
- Rochester, MN
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Identification of Biomarkers for Stress Vulnerability and Resilience
University of Michigan
- Location
- Ann Arbor, MI
- Eligibility basics
- Ages 18–22
- RecruitingHealthy volunteers
Investigating New Methods to Study Movement in Children and Young Adults With Movement Disorders.
National Institutes of Health Clinical Center (CC)
- Location
- Bethesda, MD
- Eligibility basics
- Ages 5–25
- RecruitingHealthy volunteers
CARRII Native Intervention Optimization Trial
University of Virginia
- Location
- Charlottesville, VA
- Eligibility basics
- Ages 18–44 · Women only
- RecruitingHealthy volunteers
Impact of Lactation Antenatal Teaching by Clinicians and Healthcare Providers
Loma Linda University
- Location
- Loma Linda, CA
- Eligibility basics
- Ages 18–45 · Women only
- RecruitingHealthy volunteers
Targeting Alcohol-Opioid Co-Use Among Young Adults Using a Novel MHealth Intervention
Brown University
- Location
- Providence, RI
- Eligibility basics
- Ages 18–25
- RecruitingHealthy volunteers
Advanced SPinal Innovations With Robotics and Enabling Technology Registry
Boston Children's Hospital
- Location
- Aurora, CO + 6 other US sites
- Eligibility basics
- Ages 0 mo–21
- RecruitingHealthy volunteers
Finding Emotional Empowerment and Lifelong Strength
Rutgers, The State University of New Jersey
- Location
- Piscataway, NJ
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Deep Phenotyping Gait Deficits in Orthopedic Manifestations of Pediatric Cancer Patients
St. Jude Children's Research Hospital
- Location
- Memphis, TN
- Eligibility basics
- Ages 5–20
- RecruitingHealthy volunteers
Comparison of Immediate Changes in Cervical Range of Motion Following Cervical Extension and Downslip Mobilizations.
Missouri State University
- Location
- Springfield, MO
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Mechanisms and Predictors of Change in App-Based Mindfulness Training for Adolescents
Mclean Hospital
- Location
- Belmont, MA
- Eligibility basics
- Ages 13–18
- RecruitingHealthy volunteers
Biomarkers for Peripheral Circadian Clocks in Humans
University of Colorado, Boulder
- Location
- Boulder, CO
- Eligibility basics
- Ages 17–35
- RecruitingHealthy volunteers
Behavioral Activation and Risk Reduction for Stimulant Use Among Sexually Active Adolescents and Young Adults
Westat
- Location
- Los Angeles, CA + 1 other US site
- Eligibility basics
- Ages 16–24
- RecruitingHealthy volunteers
Pathophysiology of Circadian Rhythm Delayed Sleep Wake Phase Disorder
University of Colorado, Boulder
- Location
- Boulder, CO + 1 other US site
- Eligibility basics
- Ages 16–40
- RecruitingHealthy volunteers
Evaluating Telehealth Delivery of Brief Alcohol Screening and Intervention for College Students
University of Southern California
- Location
- Houston, TX
- Eligibility basics
- Ages 18–26
- RecruitingHealthy volunteers
PROspective Study of Mothers' and Infants' Social and Epidemiologic Determinants of Health
Northwestern University
- Location
- Chicago, IL
- Eligibility basics
- Ages 18–44 · Women only
- RecruitingHealthy volunteers
Squat Jump Performance and Chiropractic Ankle Manipulation
Northeast College of Health Sciences
- Location
- Seneca Falls, NY
- Eligibility basics
- Ages 18–35
- RecruitingHealthy volunteers
Postprandial Effects of Fresh Mango as a Table Sugar Replacement in High-Sugar Breakfasts.
Ball State University
- Location
- Muncie, IN
- Eligibility basics
- Ages 18–45
- RecruitingHealthy volunteers
Our Voices Matter: Intervention for Depression in Youth
Ann & Robert H Lurie Children's Hospital of Chicago
- Location
- Chicago, IL
- Eligibility basics
- Ages 15–20
- RecruitingHealthy volunteersPhase 4
E-cigarette Cessation in Adults Who Co-use Cannabis
Medical University of South Carolina
- Location
- Charleston, SC + 2 other US sites
- Eligibility basics
- Ages 18–40
Questions
If I fit this group, will I qualify?
Not necessarily. Age and sex limits are only the first filter. Each study has its own inclusion and exclusion criteria, and the research team decides at screening.
Where do these age and sex limits come from?
From the eligibility section of each study’s official ClinicalTrials.gov record. We don’t infer eligibility from anything else.